有限字长对自适应噪声对消器输出信噪比的限制
THE RESTRICTION ON OUTPUT SNR BY FINITE WORD LENGTH IN ADAPTIVE NOISE CANCELLER
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摘要: 本文讨论了LMS自适应噪声对消器的有限字长效应。推导了包括量化噪声和截断噪声的输出信噪比的理论公式。如果某个量化字长能反映出输出弱信号的变化,输出信噪比主要取决于自适应运算的字长。Abstract: The effects of finite word length in LMS adaptive noise canceller are discussed. The theoretical formula of output signal-to-noise ratio involving quantization noise and round-off noise are derived. If the variation of input weak signal can be reflected by certain word length, the output SNR mainly depends on the word length of adaptive operations.
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